[PARO-779] Prep for v2.2.1 release; remove six dependency (#65)

* RM no more six dependency

* MAINT version bump to 2.2.1

* MAINT update changelog

[PARO-779] Prep for v2.2.0 release (#64)

* MAINT CircleCI: drop py3.4, add py3.8, specify only py3.x minor versions

* MAINT drop versioneer; update setup.py

* DEP minimal versions in setup.py, exact ones in dev-req txt

* MAINT update MANIFEST.in

* MAINT update readme

* MAINT add twine check in CircleCI for PyPI compliance

* MAINT update changelog

* MAINT more setup.py updates

* MAINT add repo badges to readme

* FIX typo in readme

* MAINT make sure setuptools is available for pkg_resources

* MAINT setup.py needs to import setuptools for numpy internal

* MAINT drop python 3.5

 BUG Include Fortran files in distribution (#55)

Make sure that the distribution includes the Fortran code needed to build from source. The C file(s) are autogenerated and not needed in the source distribution.

MAINT Use setuptools (#54)

Use setuptools and update classifiers

Version 2.0.0

initial release